import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
public class test2 {
     @SuppressWarnings("unchecked")
 public static void main(String[] args){
         ArrayList list = new ArrayList();
         list.add(new Person("lcl",28));
         list.add(new Person("fx",23));
         list.add(new Person("wqx",29));
         Comparator comp = new Comparator(){
          public int compare(Object o1,Object o2) {
              Person p1=(Person)o1;
              Person p2=(Person)o2;  
             if(p1.age<p2.age)
                 return 1;
             else
                 return 0;
             }
        };
         Collections.sort(list,comp);
         
       
         for(int i = 0;i<list.size();i++){
             Person p = (Person)list.get(i);
             System.out.println(p.getName());
         }  
     }
     public  static class Person  {
      
      private int age;
      private String name;
     public Person(String name,int age){
      this.age = age;
      this.name = name;
     }
     public int getAge() {
   return age;
  }
  public void setAge(int age) {
   this.age = age;
  }
  public String getName() {
   return name;
  }
  public void setName(String name) {
   this.name = name;
  }
    
       }
}